Publication Type:

Journal Article

Authors:

Chubb, P. T.; Vogel, D. C.; Peck, D. C.; James, R. S.; Keays, R. R.

Source:

Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre, National Research Council of Canada, Ottawa, ON, Canada, Volume 31, Number 12, p.1744-1748 (1994)

ISBN:

0008-4077

Keywords:

Algoma District Ontario, Canada, Canadian Shield, cataclasis, eastern canada, intrusions, layered intrusions, Metamorphic rocks, mylonites, North America, Ontario, Paleoproterozoic, Precambrian, proterozoic, pseudotachylite, Sudbury structure, superior province, upper Precambrian, veins

Abstract:

Bodies of pseudotachylyte have been identified near these intrusions, 25-40 km WSW of the W margin of the Sudbury structure. These breccia-like bodies locally form extensive vein networks and are preferentially developed along the contact between the intrusions and older Archaean granitic rocks. They comprise variable proportions of locally derived rock fragments and an aphanitic to fine-grained crystalline matrix that commonly displays flow textures. The veins appear to have formed by intense cataclasis and/or frictional melting. Their location may coincide with one of the concentric bands of relatively intense Sudbury breccia development observed to the N of the Sudbury igneous complex.

Notes:

GeoRef, Copyright 2018, American Geological Institute.<br/>1995-006716<br/>East Bull Lake Intrusion<br/>Shakespeare-Dunlop Intrusion